Exhibit 23

                        Consent of Independent Auditors

We consent to the incorporation by reference in the following Registration
Statements: (i) Form S-8 (No. 333-21287) pertaining to the 1996 Stock Incentive
Plan of International Telecommunication Data Systems, Inc., (ii) Form S-8 (No.
333-21283) pertaining to the 1996 Employee Stock Purchase Plan of International
Telecommunication Data Systems, Inc., (iii) Form S-8 (No. 333-47865) pertaining
to the 1997 Stock Incentive Plan of International Telecommunication Data
Systems, Inc., (iv) Form S-8 (No. 333-57093) pertaining to the 1998 Stock
Incentive Plan of International Telecommunication Data Systems, Inc. and (v)
Post-Effective Amendment No. 1 on Form S-3 (No. 333-60223) pertaining to the
registration of 606,673 shares of Common Stock issued in connection with the
acquisition of the TRIS Division of Computer Sciences Corporation of our report
dated February 16, 1999 with respect to the consolidated financial statements of
International Telecommunication Data Systems, Inc. included in this Annual
Report (Form 10-K) for the year ended December 31, 1998.

                                                      /s/ Ernst & Young LLP

Stamford, Connecticut
March 29, 1999